SHED RACING - Hall Scott - Carbs and Compression - Cult Chat
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- Опубліковано 30 вер 2024
- Happy Easter.
Whilst most of you enjoyed some time off, Ivan has been in his Shed fettling up Hall Scott engine parts and figuring out how to make the Peugeot Indianapolis car more powerful.
In this video he talks about his Miller carburettor - a masterpiece of design, which he hopes to use in the place of the 2 x Zenith carbs. He also has ambitious plans to make some pistons, which he explains.
The Miller Carburettor is beautifully designed and made and I agree with everything Ivan says. However, on my Hall-Scott engine the barrel throttle would freeze on cold mornings and it took a while to get things warmed up despite having a heated inlet manifold. The other issue is that the carburettor bowl is small relative to the size of the engine so the fuel pressure according to the handbook needs to be in the 3 to 4 PSI range which in my experience tended to overcome the needle and seat leading to flooding. Ivan, if you were to get in touch I can send you a copy of a Hall-Scott manual which gives all the specifications including jet sizes and clearances in the engine. As for the pistons the original ones need 18 thou clearance between piston and bore so they are clunky.
Thanks, already have the manual. Thanks for the offer
Susie as lovely as it may be, stop showing us the top of Ivan's head, it's the parts in his hands that we want to see. You are both a dream team and I love every moment.
Maybe he needs to stop putting his head in the way of the camera.....
@@suziepilkington5600 I think we would all be seasick if you kept dropping the camera angle every time Ivan stuck his pate in front of the lens, ha, ha. 🥚🥚🥚🤢🤮
Miller and Goossen were true artists.
I work as a manual development machinist and worked on historic racecars and learned to make everything as accessible and adjustable as possible when you design a new part or machine.
I think Millers are the most beautiful of all vintage racers.
Oh, and I have a copy of the Golden age, I'm a collector and it's my favourite book.
You sir are an inspiration to us all keep up the Fabulous work Your Enthusiasm Knows No bounds.
Utterly brilliant.
👍👍👍👍👍
THANK YOU
Ivan, I was waiting for your to say "tiger seal" when you were talking about the rocker and felt issue.
Yes a missed opportunity!
beautiful contrast, work off picasso and a miller carburator explained by Ivan !!!!!
Beautiful carburator a work of art !
Thank you! Cheers!
Ivan, Suzy and John, you are absolute stars. Thank you for taking the time and effort to make and share these videos, and just as importantly, your knowledge, passion and thinking.
I hope Goodwood is a roaring success. 🏁
**. Move the wrist pin down to raise compression to keep the piston lighter! Maybe add .050" to the top to allow for fine adjustment, maybe put more of the combustion chamber inside the piston? Dish the piston .200" and raise the piston .350" to get the air/fuel in s smaller area for more efficient combustion!
I love the focus on solving the problems and it not being about the money, the openness about not knowing all the answers is refreshing. Stay awesome
Ah the Miller book (Mark Dees) I treasure mine above all else. And I learned more about carburation problems and designs from that than anywhere else including a mechanic apprenticeship in the 70s and now 50 years of experience. That carburettor chapter is brilliant.
He has drawings of the jet arrangement in the book and mentions meetings with Ettore and swapping design ideas sketched on menus and cigarette packets!
Best wishes to you all in the workshops.
Give mr Millyard a bell he might know
Come on.... Millyard makes ridiculous circus act contraptions... different world to this vintage stuff
I think Allen might be Ivan’s grandson?
I only understand 50% of this, but I know 100% of the importance of getting this all recorded. I love this channel.
Regarding piston making.
I would see seek advice from the foundry fist , they may suggest lost wax casting method using scion moulds taken from the original you were holding in your hand, It could be made from four a part mould with the gaugeon pins as cores.to hold every thing in place. Lost wax is used for low volume production and is cheaper. Just a suggestion..
I know some jewellery is made lost wax , poor quality generally and poor wear characteristics…very poor.
@@Pete-z6e I suggest this method because it's used by Ferrari for their engine parts
We want to do it all in the shed (besides pouring the metal)
I think the best suggestions so far from your unusually competent YT commentors, is to build up the top of the pistons or bolt a piece on with some careful heat bedding.[ needs more thought] You are inspiring a new batch of thinkers which is a great outcome whatever happens.
good luck !
Thanks, we have had someone on the phone who has built up the top of the piston without trouble.
I am more impressed with every video. Ivan would refuse to be called a genius but we know better. Amazing mind.
Ivan your a Bleeding miracle as is your H&S love the video thank you Susie for your camera work.
Your excitement and enthusiasm for all things mechanical is extremely captivating. Can not wait for next installment. Regards Mick.
Kind words
Not just good filming, also good directing. (Managing Ivan and John must be like herding cats) 🤣😂
Classic video Ivan, the crankshaft looks to be the weakest component of the engine, make your compression mods gently, and see if you can improve crank lubing as well. That carb is brilliant, very clever, Can't wait to see it all together and running! Watched the Indian lads cast a new cylinder head by sawing the old one in half longitudinally to make the internal core moulding. They are brilliant engineers, really thinking their way around problems!
Love to all!
Phil , East Yorkshire
U 7th
Great point!
ivan your energy is amazing
Hi Ivan, I always enjoy your videos a lot and I think we met in the London Mews together with John Leyland in the early 80th. However, I don’t think you remember me. Anyway, the father of a very goodored the car friend of mine has a very nice Salmson. When he restored the car the engine block was too far gone and he had the wooden forms made, to make a new block. Maybe you are interested in these blocks to make some engine blocks. However, the father of my friend is already in his 90th and quite difficult, if you know what I mean. On top the transport is more complicated since Brexit! Anyway, if you are interested, I will try my best to convince him to lend you these forms! Best luck with your interesting Hall & Scott!
Yes, Very interested thanks for thinking of me
@@shed_racing Hi Ivan, how can I contact you, maybe by email? The wooden Forms are of course in Germany, as I am as well. I will ask my good friend who will talk to his father. As I said he is a difficult man in his 90th! By the way, do you know John Leyland of Coys of Kensington at the time, later with Charles Howard? I think you were described to me as the „Mad Man“ who tastes petrol, if it was still good! Could that have been? Hope this is not offending!
Ivan your plate to hold the return spring for the throttle will have to go pointing to the rear of the car to work .🙂
Yes, was focusing on the chat. Well spotted.
Thanks Ivan I know its difficult to get everything right, you are doing so well with this channel of yours keep going my friend 🙂
For information, piston engine aircraft can, and do, run at full power (flat-out) not only during takeoff but also during climbs which can be for considerable time. 😉 However during full power operation the mixture is always set to full rich which aids cooling.
If we use full power is there any chance it will take off at Goodwood?
@@shed_racing You would need to add some side mounted appendages to get airborne, mixture rich, full power, chocks away young chap! 👍😁
Great video Ivan, ref the oil draining from the cams I think you answered your own question, firstly you mentioned the small rocker box oil drain and you showed us the original low pressure oil pump, then you mentioned your modified dry sump system and the accompanying high pressure oil pump. So is that high pressure oil pump also feeding the cams, if so then the cam boxes will need bigger drains, won't they?
I wonder if it wouldn't be easier and cheaper (considering you're only making 5) to just have them cnc'd out of some nice round stock. Since they're not going to be anything like an authentic original piston anyway, you can definitely use an alloy that grows a lot less, get your tolerances a lot tighter and you definitely won't be needing that ring at the skirt bottom.
Or maybe get a computer wizzkid to print them , I've seen some amazing things done by our new generation of engineers.
5 axis CNC out of billet stock would be worth looking at more expesive than sand cast but faster turnaround
Good idea, not as fun as doing it in the shed though...
Great stuff Ivan. Very right... "It's the finesse, not the size." I agree with you that Harry Miller was "the man". I've had Borgeson's book since it was first published and I was just out of my teens. As a Mechanical Engineer, I've since regarded it as the bible when it comes to engine design. Looking forward to seeing that carb fitted to the Hall Scott! Cheers!
Hastings in the US has rings available individual purchase in all manner of bore sizes, thickness, and profiles. Very handy for getting oboslete engines running again.
Give it a look. Another possibility if that engine has a 5.25 inch bore is to use a ring set out of a Continental IO-550 aero engine, should reduce friction with more narrow rings. Keeping with aero engine tradition the wrist pin could be retained with plugs like Lycoming P/N 72198. Regards.
For the piston scan it and get it 3D printed, you can adjust the size once scanned and print it out for a dummy build. Then adjust size if required and print a new one for use as a pattern or get it 3d printed in metal.
Cant do this in the shed
Hugh I didn’t know of such thing as a metal/3d printer? That sounds excellent? Any more info?
You can do it anywhere, the scanners are hand held, scan goes straight into a pc. Take it away print out the part and you can then use it as a master. Once you have the scan you can adjust the size before printing.
Google or search on here loads of information. I work in the defence industry and they been metal printing components for a decade. It has filtered down to general use but I doubt it’s the same quality, but it’s available.
@@hughmillward705 thanks for that info Hugh! ( defence industry eh?) I bet those damn tanks take a while to print! ( just joking) live long and prosper buddy! 🖖
Gentleman Ivan let himself down at the very end (but as he’s well over a 100 now I suppose we’ll have to forgive him just this once though..)
BRILLIANT video Ivan and Susie. You make a great team. Very entertaining. Cheers from OZ.
I have been enjoying all your videos, the Miller carb is a work of beauty. I have a Master carb, the is similar in design and believe Miller had a hand in. I will look for my brochure on it and share it here, if i can figure out how.
well that was a surprise video thank you Ivan and Suzie , i do like the way you take us along and explain things , and love the bit of banter with Suzie she is a quite a lady ,
On the pistons, have you thought about the loss foam casting system? Apparently they make the piston out of foam, then its packed in sand, and the Aluminum is poured in, as the hot metal hits the foam, it gasses off leaving behind the casted piston.
Hi Ivan. Love your channel and watched every video. A way of machining an oval skirt on a piston without a piston cam grinder is to turn the piston skirt round in the lathe, with still a bit to come off before finished size, then make a "jack" out of washers and a bolt, or thread stock, that will fit between the gudgeon pin bosses. By jacking the bosses apart you will make the skirt oval. Turn the skirt round again and when you remove the Jack the piston will be oval the right way - with the thrust faces proud and the gudgeon area relieved. With a bit of experimenting you can make as much finished ovality as you need. Machine the skirt with the desired taper, and Mr Hepolite would be proud of you! Keep up the good work!
Hi you talked about the possibility of using truck piston rings If so could you not modify truck pistons as well?
Brilliant. Thanks for putting up with him Suzi😂
Have you ever seen and heard an old block go on and on about a carburetor just like a child at Christmas with a new toy!! 😀😀 Great video . .Alberta)
Love your channel Ivan, and thanks to Suzie for the video and editing effort. Well done! Love the regularity immensely.
I've seen vintage engine guys add a machined aluminum dome piece to the tops of their pistons. Two blind studs and nuts holds them on, yes they drilled the piston tops (tig repairable later if needed) and had access to the nuts from the underside of the piston. They made a few different thicknesses so testing and swapping was easily done.
Another thought, the use of gapless piston rings on the second groove (check out Lake Speed on UA-cam) reduced blow by and increases compression. Interesting technology.
Lastly if you want to cast new pistons, find a clever lad who can scan the pistons into a CAD file, add your shrinkage and machining allowances and 3D print each core / pattern from a material that is designed for melting away like the lost wax process does. Makes sand casting incredibly easier and you only need 4. Also you can machine ring grooves to suit a more modern set of rings that may improve compression too...
Best of British old son, kindest regards from your antipodean cousins (NZ)
Got to be done in the shed!
What’s the secret of your enthusiasm Ivan? Where can I get some?
I just love cars - have been thinking of little else
Most people enjoy their personal gift. The secret is discovering it during one’s own lifetime.
Is it possible to weld a shallow dome onto the piston tops to increase the compression and then use your slimmed rings, it seems a bit simpler. In medicine we often prefer Occam's razor, but obviously I'm no engineer (or specialist welder for that matter).
Or bolt on a dome/wedge for that matter
I've heard of people doing it but a bit frightening
@@shed_racing I've also heard of some bronze "skulls" being fitted Into the combustion chamber, both to increase the compression and the squish area, but all a bit daunting and above my pay grade.
That barrel on the miller carb looks like it opens the wrong direction,the spring would pull it open not closed, unless you turn the body round..Ian..??
or fit the bracket and spring other side of the carb. so it pulls back towards rear
Well spotted! We will fit it the other way around
And the other thing is , Ivan you are a star and I love the way Suzy milks the information from you, together with John, you three make an awesome team. So much knowledge and skills on video for future generations.
Thank you guys .
Great stuff. Thanks a million!
Hi Ivan, Suzie & John. thinking outside the box. There must be other engines out in the world that have the same size pistons as the Hall & Scott? Diesel pistons can be taken down, I'm guessing. What is the compression on the Hall & Scott? Is there room in the head to cone it? Same with the piston. You know where I'm going with this, lol..... How is the red mini coming along?? Love your show... Keep up the great job, folks.... 😊 😊
Red Mini is waiting for tyres, very busy getting the other car ready.
@shed_racing Great to see Tom driving. Suzie's Bugatti is a winner also.
I look forward to your antics as & when they pop up. Thank you for your channel also, Ivan...
All the best from NZ...
Hi Leo, Aldo wrote on my whatapp ... Re: rings for a Miller Engine....
Can do, need bore size, thickness of the rings and width and how many rings all together... Then we czn give quote. Will have FedEx it to them which will be extra on top of ring price...Ivan this was a message from Aldo's Mom.. Aldo is quite famous in South Africa.. He and his Mom are my very close friends.
Thanks, we will keep this in our mind
Carburettor. One can see why the American’s were 40 years ahead of the British in thin wall casting. As to regulation of charge to cylinders you are ‘merely’ looking at 14:1 air fuel ratio. Jetting is to achieve this over a variable distance between sea level and a mountain top. Hence SU’s are better average than more precise Webbers. Your variable window will require little adjustment between your garage and Goodwood.
Piston. Several points which might be considered the grooves in piston sides are indicative of old Scott motorcycle pistons with dashes on piston wall to aid lubrication. Scott’s were a two stroke. The rings you show are interesting in they are all upper area of piston with a lower apparently across the fudge on pin. Does the lower end of piston project beyond cylinder and if not would a lower ring achieve better piston stability in bore and reduce piston friction?
Concerning ovality this was common on GM series cars in thirties particularly Vauxhalls Big Six and the 25hp the manual of which is before me. Ovality was 13thou on bore of 81.94mm. On standard or oversize bores the piston should jam - their word - on 15 thou feeler an inch down the bore 90 degree opposite the plane of the gudgeon on a stroke of 101.6 mm. 10 degree variance will cause a notable error!
The piston had an Invar strut across it presumably across the gudgeon because it would restrict expansion across the narrow section of the bore. Invar expands less than aluminium and was used in thermostatic switches years ago. The pistons were tapered towards the bottom.
Oil. Mr Ricardo in his biography made the point that pre WWI he discovered that on slow revving engines of the day he gained engine performance by exchanging vegetable oil for mineral oil. All the bearings require is oil between surfaces. This was contrary to the view of the day which looked to mass. Your oil evacuation looks to be 1/4 BSP so next up at 3/8 would be a sizeable increase and look in scale to the engine. I like the O ring idea. If the air in the sump could pump into a chamber, copper or steel tank perhaps with a diode vent and return drain would this solve pressurisation. Try a temporary experiment with a plastic lump as you can see it breathing and see if viable or not and throw it away if it does not work!
I enjoy your work and challenges!
Taken it all on board.
'old Dave Woods is gone ', very sad that these old fellows are going & taking all that knowhow with them , the same here in OZ these fellas are hard to find now
Clever stuff, thanks team
Off the wall Why not consider building the top of the pistons up with some tig welding !
Have you seen "Making Pistons for experimental and restoration engines" by Stephen Chastain? People seem to be asking stupid money for copies, but you'd be welcome to borrow mine.
You can see the parting lines for the 3 part core in the piston. It should be possible to take moulds from your piston without cutting it in twain.
These days, I'd be thinking about 3D printed patterns. It's possible to 3D print 'wax', or many people are using PLA plastic for the purpose.
Yes, and could add in the extra for shrinkage, too.
Thanks very much but I think I have enough knowledge of pattern making to be able to bodge something up
Susie. Please make sure you show what Ivan's talking about. He's obviously a very handsome man, but it's what in his hands that actually interesting.
I get that all the time
@@shed_racing Oh. I am sorry. I did not mean to 'have a go at you'. As otherwise these videos are an absolute delight.
think thats the end ....😁
Perhaps put yourself in a wet T ? ;) Rubber bushing or perhaps copper on the rockers... Indeed is a beautiful carb. Any plans to polish the insides? Lovin it !
No plans to do anything clever
When I made my own pistons, after machining the piston slug on the inside, the pin bores done and to the required outside diameter for the bore, I got the taper and ovality needed so as when the piston got hot and expanded unevenly due to differing section thickness and proximity to the heat it could do so without nipping up on the upper part of the skirt and the sides. To achieve this I jacked the pin bosses apart from the inside using a piece of threaded bar and 2 nuts, winding the nuts out so the pin bosses are forced apart, this caused the piston skirt to distort, the amount can be measured with a mike or vernier and the jacking nuts adjusted to get the required amount of distortion, I used 0.020" at the bottom of the skirt under the pin bosses on 94mm dia pistons, then take a light skim over the skirt in a lathe to clean up you will be able to see that once the pin boss jack is removed the piston skirt adopts an oval and tapered shape just like commercially manufactured race pistons made from a relatively high expansion aluminium alloy, this worked a treat for me on various race engines pulling high revs. Think about it and experiment with some old pistons Ivan and you'll see what I'm getting at. Good luck my friend, Roland, HT Racing Ltd
Taken on board
Was the Zborowski car one of his Chitty Chitty Bang Bangs?
It was a genuine 2 seater Miller made for Zborowski
Haha! That ending made me laugh out loud. Well played!
Already over 21k Ivan!
😂 *close up of Ivan's head*
Ivan: "In there, there is nothing!"
unintentional but funny !
Burt monroe cast his own pistons for his record holding worlds fastest indian.
Lets hope we have similar success! He was a real star
Ivan the o ring idea on the rocker fulcrum is good but o’rings don’t like movement so will probably work harden on wear away extremely quickly. I would use bronze bush washers with a very close tolerance.
Harry Miller sold his early carburettors from 1912 onwards. He offered kits for everything from Offenhauser racing engines to Model T Fords. If you are making new pistons would they be in aluminium rather than cast iron? Farndon Racing in Coventry would make you a new crank but don't hold your breath. They made a lovely fully counterbalanced new one for our Bentley Speed Six (The H.M Bentley Rabagliati Special) but delivery was slowww.
Your a great man to listen to down to earth valued
as long as we dont have Ivan in a wet tee shirt contest I will keep subscribing! 😁
Deal!
Well, well Ivan you've been very busy over the long weekend while we were all partying! Nice job on the Miller carb, a thing of beauty. Seems quite a simple design compared to the many carbs I have torn down & rebuilt. Pure utilitarian. I wish you well with it and hope it gives you a bit more power. Cheers for now from Canada!!! Paul.
Inspirational and thought provoking as ever. The piston project will be very interesting, if anyone can achieve the machining, it must be John. Having visited the Bristol Engine Heritage Centre at Rolls Royce Bristol, I can share your appreciation for early aero engine quality.
Best wishes, Dean.
Many thanks,Ivan.
I'm not sure, but the Miller 'Master' carb was patented in 1917 and has all the same parts as yours. There is a fascinating article on the web fitting a Miller to a model T. Replacing a Winfield carb which was apparently miles better than standard. Winfield was Millers understudy. Well the Miller was miles better than the Winfield...
Wonderful as usual. I can't say how much I love your channel, I'll end up sounding like a loony.
I've owned several. Amazing carbs! I have a barrel valve alcohol carb on my Harley Davidson DAH racer from the 30's.
Exciting plans afoot! There you are waxing lyrical about a carb with a naked Bugatti right behind you! Sometimes reality is surreal.
You probably known us it’s very similar to the Claudell Hobson car racers on our Sunbeam land speed engines enjoy your program Michael
It has to be a compliment to Millar if Bugatti, that master engineer and artist,copied his design. Thanks for the carb talk lvan.
15:07 is that similar to Dwarf throwing? Times where different back then 😂
Nothing so wicked, I'm talking about midget cars
@@shed_racing I know, I was just being daft.
I hope I didn't offend
Charlie
Reminds me of the stories of Burt Munro of World's Fastest Indian fame casting his own pistons using an old bit of gas pipe as the basic mould !!!
Perhaps a PCV reed valve (extra large) may help with the smoking, I'm sure you've considered this already.
Gold. Thank you for the insights and the entertainment. Keep asking the questions, Susie!
I have a bit of 4mm thick sheet of insertion rubber on my bench so I am not working on the bare steel that will make the aluminum surface on the carb.
for the few thousands hight required on the pistons you must be able to crank the gugin pin as its a fixed pin maybe a two piece pin just a thought Ivan
one thing I noticed on your current twin carb set up is there doesn’t appear to be a balance pipe fitted between the front and rear inlet bank of cylinders so you’ve got cylinder 1&2 running independently to 3&4 ?? Maybe there is one that I can’t see but I would strongly suggest fitting one before you remove the current setup as it will make the engine run a lot smoother and pickup quicker.. sounds silly in comparison but I trial a twin carb Bullnose Morris and when I first built it I forgot to engineer in a balance pipe so it ran just like your current setup and it was a bugger to get right and very lumpy .. after a while I drilled the manifold and added a pipe between the front and rear carb and the thing now flys !! It also gained a lot more low down power (not sure why but I think it maybe down to smoothing out the suction pulses ?)
You are dead right. I actually know the importance of a balance pipe but hadn't thought of it until you mentioned it. We are actually going to do it to the manifolds in case we put the twin setup back on.
What diameter are you thinking?
I’m glad you took the time to read my comment as I love watching your videos 👍 I would guess at half the size of the carb bore ? I remember it used to be a thing to do on the twin carb A series manifold to punch out the balance pipe plug and open up the hole inside to allow more gases to move across… I think it would be a good thing to do before you fit the bigger single carb so you can get a better understanding of how much better the bigger single carb will be compared to the twin carbs ? Look forward to seeing how you get on with it
Russ
@@hennessymotorsportltd7756very good logic but also remember you are balancing between two very similar levels so not really needing to act as an effective transfer tube of any great volume assuming they were almost balanced by design anyway…
I subscribed from the very first videos on your original channel. You appeared a little nervous back then, but you've relaxed into it now and it just gets better and better with every new video you and Susie put out. Well done the two of you, keep up the good work!.
You don't need my advice, but I'll be watching. Cheers from a shed in Iowa
Ross Pistons can make a set, with rings and better design wrist pins.
No fun!
I'd rather melt beer cans too.Winkwink.@@shed_racing
Ivan your lovely film crew is a wonderful asset so make sure you do what you are told.😁
👍🇦🇺
Lovely watching the work you all do and thats a great work space
I would put the original spring back.
Ive. That crankshaft is choice. Acting as a centrifugal oil pump for the big ends. Bloody brilliant idea. With the cute little catch plates. Over the last 15 years or so, I have come to respect american engineering. I totally agree with you. Alot of thought, without any engineering fuss. The stuff works and works well at that. Tnx goes to Suzi once again for the pertinant questions.. I'll run my thoughts on the oil pump by you just as soon as I am able. Take care. Bw from the Forest of Blackness. Mike.
Early British and other cars had troughs of oil flicked up by fingers on the big end bearings. The troughs were filled by an oil pump. This works fine at low powers but increasing load needs flow or the oil gets too hot. Cheers Martin.
The smell of racing fuel and exhaust fumes, racing cars, lots of tech talk AND a wet 't' shirt...takes me back 60 years, what's not to like? Ivan you rogue, all of us "old boys" should be inspired. You and Suzie, living the life!
Having fun!
Good old Ivan,they just keep on coming!
I love this channel and have been following Ivan since he was very old.
Suzies filming your bonce and your telling the world "and in there is absolutely nothing"😂
You guys are the best .
Thanks for the vids x
yes a fair bit of Ivan's head - but we certainly weren't thinking of a second take
Can't imagine not honing the pin bore to final size. There's a guy on here with a channel called oldfoundaryman, Australian, who cast a piston for some vintage tractor or car. He's an expert at that sort of short run specialty thing.
Yes, we will have a look
Harry Miller was a true genius. He was running front wheel drive cars long before anybody else, dominated Indianapolis and even inspired - or got ripped off by Bugatti. But I can't get my head around updraught carburettors. Surely dirt and water would be sucked into the engine with them being so close to the ground. Which is probably why they were replaced by side draughts. I can't help imagining a Miler carb on a more modern engine such as a Ford Flathead or a small block OHV V8. That huge choke would produce loads of power and look amazing!
Yes, you are right. The Bugatti is nearer to the ground than the Hall and Scott
Love that carb! Wet T-shirt, now there’s an idea!
Another great video from the Shed team. Might I suggest that you use a simple slipper design for your new pistons as this would greatly simplify the patterns and machining making any oval turning unnecessary.
You could also offset pour the Babbitt rod bearings (thicker at the beam side , thinner at the bottom) effectively moving the piston higher in the bore.
Scared to touch the original babbitt
Got a feeling that an aero engine and it's carburettor is designed to run at a constant speed more of the time, would the miller carb have the on, off, up, down responses that a carb designed for a car would have, I may be wrong.
You may be right, we are going to find that out
Ivan, what about machining a square trench beneath those followers and installing a rectangular section cork seal or something similar along it . The ring on the ends is a great idea. Cheers to all and look forward to the next episode.
Yes we are thinking along those lines
Ivan you can get close on the piston hole and take it to final size with an adjustable reamer. Regards Hugh.
We will see
Well Ivan for the first time I've seen you lost for words, well done Suzzie.
Thank you - quite an achievement
Ivan, ensure you reverse that spring bracket otherwise you'll have the sprng opening the throttle rather than ensuring it is closed
Well spotted but I was thinking of what I was saying rather than doing!
Hi Ivan, you mentioned a book called tuning for speed, who is the Author? I've seen two books, one for motorcycle engines and one published by Haynes with a ford Escort on the cover.
Thanks and keep up the good work. Can't wait to see the Mini comparison!!
All the best
Josh
2 wheels or 4 they are the same principles at play, in fact the author of 'Tuning for Speed' - Phil Irving - used BSA Gold Star Cam profiles in his 1966 F1 winning v8 engine.
I did my original apprenticeship in the mid seventies working for Prof. Robert Gaylor at Piper cams. He was considered the cam guru in those days…
How about getting some casting cores made by 3D printing.
Yes but we want to keep it in the shed.
I would think you could find a piston from a Diesel or something big that could be modified to fit in the Hall Scott. Have you tried any of the racing piston companies to see if they have a blank that might be usable? Lots of modified diesels are being built someone is manufacturing those pistons.
You could be right, more fun to make it yourself :)